Recessing-machine.



O. M. MOWAT.

RECEBSING MACHINE. APPLIIOATION FILED JULY 30,1900.

967,219. Patented Aug. 16,1910.

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Patented Aug. 16, 1910.

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O. M. MOWAT.

BECEBEING MACHINE.

APPLICATION FILED JULY 30, 1900.

Patented Aug. 16, 1910.

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UNITED STATES PATENT OFFICE.

OLIVER M. MOWAT, OF MQKEESPOBT, PENNSYLVANIA, ASSIGNOR 'IO NATIONAL TUBECOMPANY, OF PITTSBURG, PENNSYLVANIA, A CORPORATION OF NEW JERSEY.

RECESSING-MAGHIN E.

Specification of Letters Patent.

Application filed July 30, 1906.

To all whom it may concern:

Be it known that I, OLIVER M. MOWAT, of McKeesport, Alle heny county,Pennsylvania, have invente a new and useful Improvement inRecessing-Machines, of which the following is a full, clear, and exactdescription, reference being had to the accompanying drawings, formingpart of this specification, in which Figure l is a plan view of myimproved apparatus and Fig. 2 is a side elevation of the same, Fig. 3 isa sectional end view on the line IIIIII of Fig. 2 and Fig. 4 is asectional end view on the line IVIV of Fig. 2. Figs. 5 and 6 aresectional detail views showing the construction of the floatin headsemployed on the machine.

y invention relates to apparatus used in finishing pipe-couplings andsimilar articles, and the object of my invention is to provide improvedmechanism by the use of which the time required in recessing suchcouplings is lessened, and the cost of finishing such couplings isgreatly reduced.

The invention consists in the arrangement of the floating recessingheads and the coupling gripping mechanism so as to permit of both endsof each of a plurality of couplings to be simultaneously operated uponand in providing improved means by which the oppositely facing cuttingheads are advanced and retracted toward and away from the couplings.

It also consists in providing novel means by which the recessing headsare automatically fed forward into engagement with the couplings andmeans by which the forward movement of these heads is limited.

It further consists in providing means for adjusting and varying thedistance between the oppositely facing recessing ads/and in providingmeans by which the annulargrecesses are cut concentric withthe bofebfthe couplings.

In the ordinary recessing machines used for recessing couplings, it hasbeen the usual practice to employ one end of the couplings beingoperated upon to hold and prevent it from rotating while its oppositeend is brought into contact with the recessing tool. This renders itnecessary to recess the opposite ends of the couplings in separateoperations. By the use of my improved machine, these difiiculties areovercome, and two couplings are recessed at one time, while both ends ofeach of the couplings are recessed simultaneously.

In the drawings 2 represents the bed of my improved machine providedwith the oppositely facing floating recessing-heads 3. The heads 3 aresecured to and rotated by means of the shafts 4 which are mounted insuitable bearings 56. Each of the shafts 4 is adapted to be movedlongitudinally so as to advance and retract its attached cuttinghead 3.

The couplings beingrigidly held between the clamping jaws, variations intheir diameters would cause the recesses to be cut eccentric to the boreof the coupling, if the recessing heads were also held rigid. Toovercome this difiticulty and to insure the recesses being boredconcentric with the couplingthe recessing heads 3 are constructed so asto permit of them floating or traveling in a path slightly eccentric tothe axis of the shafts 4.

As shown in Figs. 5 and 6, the shell 43 is secured to and rotated by theshaft 4 and on the inside of this shell is a disk 44 having a tongue 45and groove 46 at right angles to each other and on opposite sides of thedisk. The tongue 45 fits into a groove 47 in the face of the shell 43and a tongue 48 on the cutter sleeve 49 fits into the groove 46 which isin the disk 44. The disk 44 and the flange of the sleeve 49 are somewhatsmaller in diameter than the inside diameter of the shell 43 to permitthe eccentric movement of the sleeve 49. The sleeve 49 is provided witha number of slots corresponding to the number of cutting tools employed(usually three) and a collar 50 fits over the sleeve and over the innerend of the cutting tools 51 to hold the tools in place, each cutterbeing held by means of a set-screw 52. A longitudinally adjustablecenter 53 is also provided in the end of the sleeve 49, the center beingadjustably held by means of a set screw 53 which extends through thecollar 50 and sleeve 49.

A spur gear 7 is secured to each of the shafts 4 and meshing with thespur ears 7 are pinions 8, these pinions having aces of such length asto always be in mesh with the spur-gears at any point of thelongitudinal movement of the shafts 4. The pinions 8 are on shafts 9which are also mounted in suitable bearings located on the bed 2 and theouter ends of the shafts 9 are provided with spur gears which mesh withthe pinions 11. The apparatus is caused to rotate through the pinions 11which are connected to the cone pulleys 12, the pulleys 12 beingconnected by means of a belt with any suitable source of ower.

Each of the ongitudinally movable shafts 4 is adjustably connected toyokes 13 which are pivotally mounted on the shafts 14, these shaftsbeing carried in the bearings 15 on the bed 2 of the machine. The lowerends of each of the yokes 13 are connected through the links 1617 withthe lever arms 1819 secured to the shafts 20. One of each of theopposing pairs of shafts 4 is provided with a threaded port-ion betweenits bearings 56 and on this threaded portion is a collar 21 to which theyoke 13 is yieldingly secured. By adjusting the position of this collaron the shaft 4 the distance between the opposite recessing heads 3 canbe varied and when adjusted, the collar 21 is securely held in place onthe shaft 4 by means of its jamnut 22. Also keyed to the shaft is a handlever 23 which is provided with a hand operated pawl 24, the pawlengaging with the teeth of the ratchet wheel 25 forming a part of thefriction clutch, the clutch being mounted so as to freely rotate on theshaft 20. The clutch consists of a ratchet wheel 25 having a frictionring 25 and a worm wheel 26 havin a friction ring or flange 26 arrangedto irictionally engage with the ring 25 and the worm wheel is caused toconstantly rotate by the worm 27 on the shaft 28, this shaft having aspur gear 29 on its outer end which is driven through the spur gear 30by the spur gear 31 on the outer end of one of the shafts 4. Anadjustable stop 32 in the lug 33 located on the side of the bed 2 of themachine, limits the forward movement of the hand-lever 23 and throughthe connecting mechanism, limits the distance that the oppositely facingrecessing heads 3 can be advanced toward each other.

Located midway between the oppositely facing recessing heads 3 is thegripping mechanism, by which the couplings are held and prevented fromrotating during the recessing operation. This gripping mechanismconsists of a stationary jaw 34 and movable gripping jaws 35. Betweenthe gripping jaws are removable supports 86, WhlCh are made removable toenable supports of different sizes to be placed between the grippingjaws, in order that the various sizes of couplings may be keptvertically central with the axes of the cuttin heads 3. The stationaryjaws are provide with removable hardened steel bits 34 which grip thecouplings when the movable gripping jaws are moved into engagement withthe couplings and prevent the couplings from rotating. The movable jaws35 are pivoted on the pins 37 to the bed of the machine, and these jawsare provided with lever arms 37 which'are connected by toggle links 38,38 and the links 39 to the lever arm 40 on the hand operating lever 41which is carried on the bed 2 of the machine by the pivot 42. The leverarm 40 is provided with an oppositely extending arm 40 on which asuitable counterbalance weight is secured.

The operation of the apparatus is as follows :The machine is started soas to cause the parts to rotate. A coupling is then placed by theoperator between each set of the gripping aws and by means of the handlever 41 and its connecting mechanism closes the gripping mechanism soas to grasp and hold the couplings in place. When the recessing headsare started, the worm wheel 20 of the friction clutch is also started torotate and, through the engaging friction faces 25 26, of the clutchcauses the ratchet wheel 25 to rotate. In the meantime the operator hasheld the pawl 24 on the lever 23 raised out of engagement with the teethof the ratchet wheel 25 so as to permit the ratchet wheel 25 to rotatefreely with the worm wheel 26 on the shaft 20. After the couplings havebeen grasped by the gripping mechanism the operator permits the pawl 24to engage with the teeth of the ratchet wheel 25. This causes the lever23 to ad Vance with the ratchet wheel and through the shaft 20 to whichthe lever is keyed, the arms 18, 19 and links 16, 17 to advance theoppositely facing recessing heads 3 until the cutting bits of theseheads are in engagement with the ends of the couplings. When the headscome into engagement with the endsof the couplings and the cuttingoperation is started, the speed of forward movement of the heads islessened, and as the worm wheel on the friction clutch is rotated at aconstant speed, the friction faces of the clutch slip upon one another,in this way permitting the positively driven part of the clutch torotate and at the same time to feed forward the cutting head at thedesired speed depending upon the friction between the slipping faces ofthe clutch, the clutch be ing constructed so as to vary the amount offriction as is desired. After the couplings have been recessed to thedesired amount and the couplings faced to the required length, the lever23 has been advanced until it is in engagement with the adjustable stop32 which limits the forward travel of this lever. The hand lever is thenraised to a vertical position, to retract the recessing heads and thegripping mechanism is operated, by the hand lever 41 to release thecompleted couplings. The recessed couplings are then removed and othercouplings placed in the gripping mechanism when the operations descrlbedare again repeated.

The advantages of my invention will be apparent to those skilled in theart. By the use of my improved apparatus the recesses are madeconcentric with the bore of the couplings, the length of the couplingsand the depth of the recesses are made uniform, and couplings ofdifferent sizes can be recessed. The output of the machine is verylargely increased and the cost of recessing the couplings is reduced.

Variations in the construction and arrangement of the parts may be madewithin the scope of the claims without departing from my invention.

I claim 1. In a coupling recessing machine, the combination withcoupling gripping mechanism having means for opening and closing saidmechanism, and longitudinally movable shafts having oppositely facingrecessing heads mounted thereon, of means for rotating said shafts andheads, means for reciprocating the shafts to bring the heads intoengagement with the opposite ends of said coupling and means on saidshafts for adjusting the distance between said heads when in theirforward position; substantially as described.

2. In a coupling recessing machine, the combination with couplinggripping mechanism having-means for opening and closing said mechanism,and longitudinally movable shafts having oppositely facing recessingheads mounted thereon, of means for rotating said shafts and heads,mechanism for reciprocating the shafts to bring the heads intoengagement with opposite ends of said coupling, means on said shafts foradjusting the distance between said heads when in their forwardposition, and. an adjustable stop arranged to contact with the shaftreciprocating mechanism, and limit the forward movement of said heads;substantially as described.

3. In a coupling recessing machine, the combination with couplinggripping mechanism having means for opening and closing said mechanism,of longitudinally movable shafts having oppositely facing recessingheads mounted thereon, a second set of longitudinally movable shaftshaving oppositely facing heads parallel with the first set, means forrotating said shafts and heads, means for simultaneously recip-rocatingsaid shafts and heads and bring the heads into engagement with oppositeends of the couplings, and means on the shafts arranged to adjust theoppositely facing heads toward and away from each other to vary thedistance between said heads when in their forward position;substantially as described.

4. In a coupling recessing machine, the combination with couplinggripping mechanism having means for opening and closing said mechanism,and a plurality of sets of oppositely facing recessing heads, of meansfor rotating said heads, connections arranged to simultaneouslyreciprocate said heads and bring them into engagement with opposite endsof the couplings, means for adjusting the oppositely facing heads towardand away from each other and vary the distance between -said heads whenin their forward position, and an adjustable stop by which the forwardmovement of said heads is limited; substantially as described.

5. In a coupling recessing machine, the combination with couplinggripping mechanism having means for opening and closing said mechanism,of oppositely facing longitudinally movable recessing heads, positivemeans for simultaneously moving the oppositely facing heads toward andaway from each other and frictional means for automatically feeding saidheads in their forward movement; substantially as described.

6. In a coupling recessing machine, the combination with couplinggripping mechanism having means for opening and closing said mechanism,of oppositely facing longitudinally movable recessing heads, and meansfor Simultaneously moving the oppositely facing heads toward and awayfrom each other, said head-1noving means being adapted to be positivelymoved forwardly and backwardly and to be frictionally moved forwardly tofeed the heads into contact with the couplings being recessed.

In testimony whereof, I have hereunto set my hand.

OLIVER M. MOWAT. Witnesses:

W. B. F ELL,

RICHARD D. JAMES.

